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7. EROSION/SILTATION RISK ASSESSMENT <br /> FOR CONSTRUCTION ACTIVITIES <br /> "EVERETT OFFICE BUILDING" <br /> Slope: <br /> THE SITE SLOPES RANGES FROM 0%TO 8%. <br /> Critical Areas: <br /> NONE. <br /> Soils: <br /> ALDERWOOD URBAN LAND COMPLEX. <br /> Ground Movement Potential: <br /> SITE APPEARS GEOLOGICALLY STABLE. <br /> Sources of Water for Erosion: <br /> RAINFALL. <br /> Measures Proposed To Prevent/Minimize Erosion: <br /> During design: DESIGN WORK DOES NOT CAUSE SOIL EROSION. <br /> During construction: PLANS REQUIRE STRAW BALE BARRIERS IN DITCHES, <br /> TEMPORARY CONSTRUCTION ENTRANCE, SEEDING/MULCHING AND <br /> FILTER FABRIC FENCE. <br /> Nearest Downstream Water Body Other Than Road Ditches: <br /> SILVER LAKE <br /> Nearest Downstream Fish-Bearing Waters: <br /> SILVER LAKE <br /> Conclusion: <br /> POTENTIAL FOR SIGNIFICANT EROSION/SILTATION IMPACT ON OR OFF- <br /> SITE IS LOW FOR THE FOLLOWING REASONS: <br /> • THE MAJORITY OF THE AREA TO BE RE-GRADED AND <br /> CONSTRUCTED IS ON MILDLY SLOPING LAND. <br /> • THE SOILS ENCOUNTERED HAVE LOW RUNOFF POTENTIALS. <br /> • FILTER FABRIC FENCE IS TO BE PLACED AROUND <br /> CONSTRUCTION AREAS. <br /> • PROPOSED EROSION CONTROL BMPS IN COMPLIANCE WITH <br /> CITY OF EVERETT GUIDELINES HAVE BEEN ENGINEERED FOR <br /> ANTICIPATED CONDITIONS. <br />